Stitch-forming device for sewing-machines.



NO. 856,645. PATENTED JUNE 11, 1907. R. L. LYONS. STITCH FORMING DEVICEFOR SEWING MACHINES.

APPLICATION FILED DEO.*12,1904.

3 SHEETS-SHEET l.

No. 856,645. PATBNTED JUNE 11, 1907 R. L. LYONS. STITCH FORMING DEVICEFOR SEWING MACHINES.

APPLIGATION FILED DEO.12,1904.

3 SHEETS--SHEEI 2 24 L A A),

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Kitty No. 856,645. PATENTED JUNE 11, 1907. R." L. LYONS.

STITCH FORMING DEVICE FOR SEWING MACHINES.

APPLICATION FILED 1950.12. 1904 3 SHEETS-SHBET 3.

[live/21502: QMJQ L W UNITED STATES PATENT o EIoE.

FROBERT L. LYONS, OF WALTHAM, MASSACHUSETTS.

STITCH-FORMING -DEVlCE FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented June 11, 1907.

Application filed December 12,1904. Serial N- 236.508-

'To all whom it may concern:

erence being had to the accompanying drawingls, forming a part of thisspecification.

his invention relates to improvements in stitch forming devices forsingle thread sewing machine which are particularly adapted for sewingon buttons.

Themain object of this invention is to so construct a single threadsewing machine for forming groups of stitches by vibrating the work withrespect to the path of the needle that the drawing away from the path ofthe needle of the first of any particular pair of 102p; is: prevented.

' other object of this invention is to so construct a single threadbutton sewing machine,i which the button and the material to whic it isto be sewed is vibrated to alternately present the holes of the buttonin the path of the needle, that the loop may be cast off the loo erwithout danger of cutting the thread,,an d a new loop taken from theneedle by the loo er.

Other objects of the invention will appear from the description andclaims.

The invention consists in a sewing machine comprising a needle, alooper, means for vibrating the work with res ect to the path ofreventing' the distortion or displacement of t e thread loop on thelooper,v whereby said loop may be in i position to receive the nextsucceeding loop,

carried tothe looper by the needle, and may be cast off thereonto.

The invention also consists in such other novelfeatures of constructionand'combination of parts as shall hereinafter be more fully describedand pointedout in the claims.

Figure 1, represents a side elevation of portions of the improved sewingmachine, partially in section. Fig. 2, represents an enlarged bottomplan view of the same. Fig. 3 re resents an end elevationfpartly' insection, 0 the same. Figs. 4, 5 and 6, represent diagrammatic views ofthe needle, the

looper and the thread positioner, illustrating successive steps in the oeration of these parts inthe sewing of a utton to fabric.

with the needle bar by t Fig. 7, represents a bottom plan view of partsof the bed plate showing the needle hole and the thread positionerapproximately in the position it occupies with relation to the needlehole when the thread positioner is holding the loops against lateralmovement.

Similar numbers of reference designate corresponding parts throughout.

ln button sewing machines in which the button, and the fabric, isvibrated with respect to the path of the needle, either back and forth,as in sewing a two hole button, or I diagonally for the sewing of a fourhole button: whereby the holes of the button are successively positionedin the path of the needle there is a tendency to effect a lateral dragon the loop of thread about the looper to-distort said loop, whereby oneside of the loop is brought to a position to be caught and broken by thehook of the looper. Or the loop on the looper may be so drawn to oneside that it cannot be cast off by the looper on to the next succeedingloop as this latter is being engaged by the point of the looper. Asshown in thedrawings 10 represents the bed plate of a button sewingmachine on which is mounted the frame 11. having the head 12 in guidesof which the needle bar 13, carrying the needle 14 is free to slide. Theneedle bar 13 is driven from the shaft 15 which is journaled in bearingsof the frame 1 1 and its head 12, and is Ipivotally connected e usualconnecting rod 16 pivotally connected with a member on said shaft andwith the stud 17 adjustably mounted on the needle bar, whereby therotation of the shaft 15 effects the reci rocation of the needle bar.The usual gui e eyes 18 and 19 are secured to the head 12 and serve toguide the thread a to the needle.

On the bed plate 10 is movably mounted the button clamp 20 of any usualconstruction and adapted to be driven in any well known manner tosuccessively osition the holes in the button in the path 0 the needle.

In the preferred form shown herein, the but plate 10, beneath the needleposition, is furnished with the usual needle passage as is shown 111Figs. 4, 5, 6 and 7.

The main shaft is journaled in bearings of the bed plate 10 and has thecam 26 and the worm 27, this shaft being driven inany usual and wellknown manner. Adjacent to this main shaft 25 is rotatably mounted thegear 28 the teeth of which are engaged with and driven by the worm 27 torotate this gear and its cam member 29 the peripherally disposed teethof which work against the bearing 23 to effect the vibration of thelever 21 against the action of the spring 24 and cause the movement ofthe button clamp.

Rotatably mounted at the under side of the bed plate are the bevel gears30, 31, and 32, motion being imparted to the gear 30 by connections withthe main shaft 25 to drive said gears and the shaft of the looper 33, ofany ordinary construction, which shaft is journaled in bearings of thebracket 34 depending from the bed plate, and is provided with the gear35 meshing with the gear 36 on the shaft of the gear 32. The looperbeing so positioned beneath the needle hole of the bed plate that a loopof thread carried down through said hole, by the needle, may be engagedby the hook end of the looper.

In the under side of the bed plate is formed the guide 37 extendinglongitudinally of the bed plate at one side of the needle hole as isindlcated in dotted lines in Fig. 2; in this guide is mounted the slide38 having at its rear end the cam slot 39, extending at an angle withthe general extension of the slide, and, in its lower surface a recess40 having the shoulders 41 and 42, and in this recess is pivotallymounted the arm 43 furnished with the hook end 44. 1 To effect they recirocation of the slide 38 from the main sha t 25, I provide a lever 45which is pivotally mounted at the under side of the bed plateand has thepins 46 and 47, the pin 46 45 eing engaged in the slot of the cam 26while'the pin 47 works in the slot 39 of the lever 38.

Beneath the bed late and adjacent to the slide 38 are, preferably,adjustably mounted the plates 48 and 49, the plate 48 having the sto pin50, while the plate 49 is furnished wit the spring buffer 51. As will beseen by reference to Fig. 2 of the drawings the finger 43 is moved backand forth between the pin 50 and the buffer 51 and, if this pin andbuffer are suitably adjusted, is intercepted by such parts and caused toswing on its pivot. When said finger strikes the spring buffer 51 it issu 44 past the needle hole and to a position for holding the thread loopagainst the drag of osed to have em, gaged the loop of threa etween theworkthe work and in a position where the hook of the looper will notpass'outside said loop, in

yielding strain may be exerted on the arm 43 which will not break thethread.

It is to be understood that this improvevmentiis particularly designedfor use in a single thread sewing machine, and preferably in such amachine in which the button clamp is vibrated to successively. presentthe holes of the button in the path .of the needle.

Attention is now called to Fig. ,4 of. the drawing in which it will beseen that the needle is on the upward movementafter having assed downthrough the hole 0 of the button Etc deliver the .loop to the looper 33,if now the button. be moved to the right, in said figure, to bring thehole (2 in the path of the needle, the tendency is to drawthe loopofthread in the same direction then carrying the side a. of said loopacross. the. path in which the hook end of the looper, moves, so that,as the looper rotates to take the loop of thread delivered by the needlethrough the hole d of the'button the hook end of the looper will passoutside of the side a .of the first loop and will break the same. Theslide,

38 is timed to move forward as .soon as the needle has moved upwardsufiiciently to clear the arm 43 and the loop of thread is engagedapproximately to the position shown inFig.

7, holding the loop of thread approXimately as shown in Figs. 5 and 6and preventing the dragging of the loop, or its distortion; by themovement of thework. As will be seen by reference to Figs. 5cand 6 thelooper may now rotate and take the next succeeding loop, delivered bythe needle through the hole (1 of the button, without: breaking; thefirst. mentioned loop, and this latter loop will then be cast ofi on tosaid secondloop. After the needle 14 has deliveredthe second loop to thelooper 33, throughthej hole (1 of the; button, the needleagain movesupward to a point above the button and the S1i'de.38 is;movejd backwardto theposition shown in .Fi 2 of the drawings. Thelbutton ib'beingienillustrationl'anjd description toilimit my infvention to such use forI=a1n-well aware, that the invention is applicable and. usefulinmachines for sewing onbuttonsfhaving more than two; holes and in whichthe movement ofthe button clamp is such: that all. the hdles in thebutton arepresentedin succession,'in

the path of the needle, as, is wellknown. in

the art. Nor do I-I desire to limit myself to the specific constructionof the thread, or

loop, positioner or to the manner in which it i is operated.

It is obvious that one of the important features'of this invention is toso control the thread loop on the looper that. thelooper may castthesame off on to the next succeeding loop without reference to theposition to WhIOh the work, or the button ma have been drawn, and thisinvention is not 'mited to an particular means for accomplishing this 0ject.

' Having thus described my invention, I claim as new and desire tosecure by Letters Patent. a

1. Ina single thread button sewing machine, the combination with abutton clamp mounted for movement to position the holes of the buttonwith respect to the needle, of a needle, needle driving means,a looper,and a movable needle thread positioner adapted to engage the threadbetween the looper and the work to resist the drawing action 'of thebutton clamp, in its movement, on the loop.

2. In a single thread button sewing mla-.

chinethe combination with stitch forming mechanism comprising a needleand a looper, of a work holder movably mounted with respect to the pathof the needle, and movable means, adapted to engage the thread beneaththe work-holder, to resist the lateral movement thereof under the actionof the Work holder.

3. In a single thread button sewing machine, the combination with abutton clam mounted for movement to position the holes in the buttonwith respect to the needle, of a needle, needle driving means, a looper,a needle thread positioner movably mounted to work beneat-hthe work andhaving a path of movement across the needle path, and means foractuating said positioner .to move the thread laterally at alternateloop delivery movements of the needle.

In witness whereof I affix my signature in presence of two witnesses.

ROBERT L. LYONS.

Witnesses:

H. J. MILLER, S. GoosTRAY.

